I went in without reading the Journal, and I was totally confused and frustrated. Once I spotted the arrow pointing to your next gun, and the "123" UI, it finally clicked, and it was fun! The movement, camera and shooting need more work, but the core idea is there, and can be easily expanded upon with enemies, attacks and level interactions (shooting could be used for other stuff, like exploding barrels or setting traps off).
Check our game! https://cerosware.itch.io/one-stick-shooter