Happy that you love the game and thank you for sending suggestions in detail <3
I've added fixes to being stuck on walls! Both for the players and enemies, you should be able to escape them in Demo 14 :)
Changing textures will be possible at some point, I'm working a bit on mod support when I can, just need to figure some things out. (skill issue on my part)
Cosmetic equipment is one of the planned updates <3
I love the ascend idea! I'll add more progression soon, the grasslands is only the first of at least three stages that will be present. Once you complete it, you'll be able to move on to the next ones!