actually three things are disturbing. The font in the workshop is so small and illegible I'm having lots of troubles reading it. Why do you use a Energy gauge for the weapon and then talk about overheating instead of running out of energy? And the targeting system is a bit of a pain.
Your game doesn't like resizing and it really need resizing because the window is so small. But when i resize then I'm shot at from off the screen and also can move there.
To fix the exp bar lag, right click in the game, press 'settings', then go to 'storage' (the middle tab), and put the slider to "unlimited".