Glad you enjoyed it! My biggest inspiration for the movement was super smash bros. melee
The slide does have frame 1 invincibility. You can yeet yourself into bullets and just delete them. I probably should have had a combo limit on the player (and make enemies actually take knockback properly). I planned to have a UI indicator of weapons, but I was already programming the boss and the combine mechanic on the last day, so I might push that in a later release.
Can't wait to see what you have planned for your future projects! Good luck in the jam!