Staleness

Staleness and Boredom is a problem in Johnny Trigger.

Levels
They are rehashed and a lot of them are the same. Most of them are easy and can be beaten in 1-2 tries.

Guns
Unless if you're fighting a boss (which is about 11.5-15% of the time), the damage and magazines mean nothing!

And if you're fighting a boss, the Super Gun "White Fury" has the exact same damage as the Submachine Gun "MP5 MK II", but the MP5 MK II is stronger than the White Fury because it has the burst and one more magazine than the White Fury.