Fun enough little game, although I think it needs some more to stand out from the other Vampire Survivor likes. I didn't experience any obvious bugs or glitches but I had some things I thought would be nice to add/needed clarification:
1. I'm not really sure what the red enemy is that flashes? Does it have something to do with the boss?
2. I received a few upgrades, including additional health but I didn't see any UI so I was never sure what was upgraded or how much health I had.
3. Speaking of health, There's not really any feedback when you get hit by enemies either. Some sort of VFX effect or flash or sound would be nice along with the aforementioned UI.
4. The flashlight gimmick is interest but I feel like it's underutilized. Maybe if there were upgrades that changed the type of light projection (like illuminate a ring around the player instead of projecting forward) or increase the light size that would be helpful. I feel like increasing the play area to allow the player to move around more and randomize enemy spawns more would also help.
Best of luck!