The map reminds me a bit of *Smash TV* or *Space Monastery*, where you move through a maze-like layout while fighting waves of enemies.
I think the map could benefit from a few more textures and some simple details, such as adding a button to unlock the next floor instead of transitioning automatically.
One thing I noticed is that the floor transitions seem to be random, right? In one of my runs, two transitions spawned in the same location, allowing me to go from floor X directly to X-2, completely skipping X-1. Maybe it would be better to prevent two transitions from appearing in the same spot. Or simply unlock the next floor only after all enemies have been defeated (although in that case, the map should provide enough ammunition).