Nice dungeon crawler — the foundation is solid, and there's definitely a lot of potential here.
That said, there are a few things I feel could be improved (which the creator is probably already aware of). For example, the bullet graphics could use more polish, and some kind of hit effect would go a long way in making combat feel more responsive. I also couldn’t see any health indicators — either for the player or for enemies — which made it hard to track progress during fights. It would be great to have some feedback on how much damage each enemy can take.
I noticed the items bought in the shop do affect gameplay, which is great, but it would be helpful to have a UI panel showing active effects or upgrades.
One mechanic I’m unsure about is the dash — I could spam it quite a lot, and I’m not sure if that’s intended or a balance issue.
Lastly, if the dungeon is procedurally generated (which it feels like), that’s a really nice touch and adds replayability.
Overall, a great start with a lot of potential for expansion!