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Glad you think so, thank you!

I'm so happy to hear you liked this!  Thank you so much for the feedback!

As long as you credit me you can use it however you please, even in a game that you plan to sell, just don't resell or redistribute the art itself(no NFTs, no merch etc)

Sorry about that!  It seems I accidentally checked off an option I shouldn't have!  Thank you so much for letting me know!

Thank you for the compliment!  I'm hoping to release something new soon!  

I think having more saturated colors to help your objects stand out is a great idea!  I can see them very clearly and your overall design is appealing as well. 
Personally I would try the terrain palette with the UI first and see if I liked it.  Sometimes high saturation can be hard on the eyes, I think. 
I like what you have so far and I think you're on the right track!   Wishing you good luck with your game!  :)

In the first version the slime definitely needed some more motion! The squish you added to it really helps!
I think that it could look more interesting if you exaggerated the squish a bit more, but you also mentioned that its a very stiff gelatin, so it could work as it is too!  

Hey there! Graphics Gale is currently free and a program that many pixel artists seem to like.
GIMP can also produce pixel art and there is also Paint.net that can be downloaded as well.
MSPaint that comes with windows can also do it, but I'm not sure if you can get transparent backgrounds with that one, I don't really use it.
I actually prefer Pyxel Edit myself, I find it to be the most user friendly and convenient.  I hear the free version is buggy but it is available.  The full program is just 9USD at the moment.  Its still in beta, but has some great features that help build tilesets more easily, has onion skin for animations, and recently had an update that lets you save a default or preset palette that you prefer.   I know you're looking for free programs right now, but its pretty affordable in my opinion and if you decide you really like doing pixel art maybe it could be something to consider in the future.
Wishing you the best of luck, and I hope you have a blast!

I'm very happy to hear that!  Thank you so much for your feedback!  :)