Lovely stuff. The gameplay loop is fun, crafting and permanently upgrading feels good, music and sfx fit the aesthetic really well.
Now, in the first level after the tutorial, that diagonal corridor with occasional spikes on the top or the bottom half - personally hated how it plays. You either diagonally run through and damage tank a lot, or you slowly stuttep step, neither of which feel good. Every other part of the level felt good, that one corridor stood out to me.
Another tiny thing is when you die you are still able to move while playing the death decay animation, very simple fix - disable all movement once the character starts playing the death animation.
Other than that - great game! And I really mean it.