This is an awesome proof of concept especially for a solo dev!! Sound effects would really bring it to life if you had more time. One art thing I might recommend is making the stone tile more faded/lower contrast (lighter greys for the darkest areas). Because the pattern is higher contrast than the player & boss and is more 'detailed', it can get hard to look at the screen for longer and distracts a bit from the focus (player, boss). I'd also recommend consistency of linework style with the interactable, e.g. black outline around the boss since it's around for the projectiles and player as well. Laughed when I got the gun, I hope you make a version that includes some close range weapons too! :)
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Thank you so much! I love to get tips from devs with more experience. The art was something i struggled with allot, I just had no idea how to make the stones less detailed whilst making them still look like stones. About the linework, I wanted the boss to give it but yet again I just didnt have time. Your game's artwork was beautiful so maybe if I can reach you out somehow, you can teach me your ways!