Demon Man Deluxe has a few obscure mechanics that may not be immediately obvious, but helpful for advanced players.

-Bomb demons will not do damage upon reaching the bottom of the screen. However, their explosion will deal damage to you. With a hitbox that janky, it's best to keep your distance.

-Hold down Q to self-destruct.

-The N and M keys toggle shaders. This should never be needed, and will cause some odd graphical behavior. Shaders are literally just gradients on top of the frame, they should have little to no performance impact. Still, I figured I'd leave this dev tool in. 

-Bullet size scales exponentially.

-The Tactical is the best hat in the game. This is objective because I, the developer, said it.

-If the game is running poorly, you can make the window smaller. Yes, it's a terrible solution. It's not a great engine the game is built in.

-Yes, it is the game over theme paulstretched.

(v1.1 edit: it is no longer the game over theme paulstretched. It is now Chill Wave)