man the artwork is banging! I would definitely check out a game with this atmosphere
I will add some feedback that you seem to have gotten already - the pace of the game falls a bit too much on the slow end. I could see where the game was going, but I just couldn't push past loop 2 when upgrades started costing 9+. Something that has helped us in the last two jams is that, whatever progression curve or design you have in mind, tune it up to 100. Make sure you provide some alone time with each upgrade, but also enable the player to reach ultragod(tm) mode in the first handful of minutes
That said, I see great potential in a game with these aesthetics and theme. You should work in some more roguelike mechanics like random perks, some synergies, different attack patterns, bosses even, and you'll be in for a good run! I'll make sure to keep an eye out for it ;)