Very, very soon! As we are speaking I'm working with  the whole cross-pack rpgmaker update (for this pack, Tar Pit and Adventure Begins)!
May I ask which RMaker version would you be interested in the most? Atm I'm  focusing mainlyon MZ/MV

Yes indeed! The next big update is RMaker files (for this and the new assets), as well as a few extra parts (and correctioons)!

There's no attack animations, which I feel is probably this assets weakest part. 

You could, but the assets would not be able to be GPLed since the license is more restrictive. While the GPL allows redistribution, the description of these assets clearly states that distribution is disallowed. So erm actually you can't distribute the game at all unless you distribute the rest of the game separate from the assets and then direct people here to download them. /hj

That's all up to you how you want to handle it.
But generally speaking when I do it

Layers:

Players
Enemies
Colliders

Ground
Foregrounds

Hello there! That's an interesting question. These tiles may work with as few as two layers (a terrain / structure layer, and an "overlay" layer for elements such as treetops and decorations with transparency). By following this strict limitation, you may be able to obtain a real retro-styled GBC aesthetic. Of course, on top of these two layers, a third one is dedicated to characters and animation.

I usually work with two or three layers as well + character/event layer, as this allows me slightly more freedom with overlaying tiles and transparent ones without making too many specific junction tiles!

That's a lovely request, and I can just say... stay tuned!

Hi David! I'm almost done with RMaker MZ (which is the easiest to set mainly because their 16x16 option and layering, allowing a more "custom" use of tilesets A, B, C, D). Character packs are already Rmaker-ready (with options for Rmaker XP, VX, Ace and MV as well)
The main issue with Rmaker tilesets (taking me forever) is the stark limitation on width and length, which requires me to constantly make more tileset groups and constantly sacrifice tiles  (dramatically so with terrains) and decoration to make everything fit in 256x256 groups.

The final result will probably still need quite some tinkering from the users, as it won't allow all the possible required combinations for each map anyways :'(

Hi! At the moment they all feature 4-directional, 3 frames walking movement!
I'm planning on adding a few attacks and other options as minor updates during the next months, but the focus of this particular pack has been tilesets and environments!

Oh! I set some animated tiled files while working and tryint the tileset, but I think it's a good idea to provide them once they're update with the new layouts. I'll be giving support to a variety of formats and layout in the next days and weeks, and I may as well add Tiled animation as well!

The visual inspiration is almost certainly based on the limited palettes seen in GBC games.

Thank you! Regarding sprite colors, I tried to follow the old school gbc games! Some of them (bosses and bigger sprites) have one more color hue to make them look richer (so they're actually black, highlight and two hues). I wanted to keep the characters quite simple and contrasted in order to make them pop a lot more withing the environment, but I also have a few more options in store... :'P

Hello! Sorry for the extremely late reply, but I didn't see this comment until today!
Sadly, due to the bundled nature of the pack resources it would be very difficult to me to make price estimates and on-demand deliveries and exports for each part of it!
I chose an affordable price policy (14,99 for more than 80 characters, thousands of tiles and animation frames) on a wide selection of tiles rather than very specific packs for this very reason!

Hehe! Thank you so much Brandon, I'm flattered! At the moment my commissions are full, but I will probably open a batch later in May!
I tend to post openings on my socials, you can find me pretty much on every platform as Zaebucca in case!
You can find all the links on my carrd!

Hey Lucas, don't worry for the bold hueheuhe!
Yes indeed, tilesets and character sprites are all together in the 14,99 pack!
I'm adding animations for bosses, a few characters and pixel battle effects, as well as rpgmaker and godot layouts, these updates will also be included in 14,99!

Hey! Yes, at the present date these tilesets included are not rpgmaker-ready! I'm still working a bit on tilesets and autotiles, which are not available yet as an rpgmaker format (I would like to provide an actual rgss file with connections and interactions working, but I'm a bit unfamiliar with rmvx, vx ace and mz and it's taking a bit of time) Characters instead are already rpgmaker-ready! 

I am planning a big release with godot and possibly gb studio formats all together!

Thank you June! Sorry, I missed the comment. :'>
This is just the beginning!

Thank you Seliel! You are my gold standard for asset packs!

Not too strictly! I took quite some liberties. Tilesets generally follow the 4 color rule, and the general palette per environment is 16 colors or less.
Character sprites, for the vast majority, are 4 colors, while bosses come in two versions: 5 and 4 colors! Their sprites may be a little too big too!

Yes indeed! I think I will update the page with some previews showcasing the fact that every character, bosses included, are available in 4 directions!
Really happy this is helping you! :'>