Thank you for playing and the feedback!
I will try and have all the placeholders replaced because yeah they're really ugly.
There's nothing to indicate that something happened, like a sound or whatever, initially I thought it's a bug that locks the game, because I thought the stage is not loading.
Mostly overlooked by me, will make it clearer.
I think enemy bullets should disappear after killing all enemies.
Good point, will do that.
When you press Tab to see info about your gun, and pick next stage and get level up window - the info about a gun obscures upgrades and you can't turn it off with a Tab.
You can remove it by hovering with the mouse, but yes its a bug, will fix.