The game is absolute trash its like playing Doom but for poor people and it feels mid at best. Play Ultrakill instead trust me

mediocre style over substance type game
go play devil daggers instead

Wallrunning is pure jank. No need to try and get it right, just mash the jump button and you'll achieve whatever you want eventually.
The SMG's are useless, there's somehow bugs that let you walk through walls, but good luck getting out again.
Checkpoints at 10HP with enemies nearby, fall off a ledge and you respawn who knows where - you get the entire package of awful game design.
The shotgun does sound and feel powerful for the first 2 minutes, after that you notice it doesn't pack as much of a punch as it should.

Overall i expected a lot more, can't even be bothered finishing the game just for the sake of it.