The game is called Putrid S4ND:

https://abhimonk.itch.io/putrid-s4nd

The game is centered around picking up different types of spells that cast when you shoot your gun multiple times. The game starts off simple, but as you pick up more spells, the game gets more and more chaotic! There are also randomized upgrades in between rooms like increasing your gun damage, clip size, reload time, etc.

The game has 5 challenge levels as well, which increase the difficulty of the game and add some replayability. Challenge level 5 gives you the traditional roguelike experience with permadeath.

You can run through the game in less than 10 minutes, and it should be mobile friendly.  Let me know what you think!