I think a lot of aspects have been pointed out by other comments like the long survival time and weapon game feel, so I won't repeat those. I think the game right now has a really interesting rougelike upgrading system, though some of the spells doesn't seem to have a low trigger chance. I really liked the feeling of gradually power up and use more spells, but I couldn't last more than the 7min mark, maybe a offer health refills as an upgrade? Other than that, I think it could also be interesting to have upgrades that changes the fire rate or projectile size, to give the upgrade system more depth. I saw you guys are gonna keep working on this, so good luck!