Unnecessarily hard. The game is very well polished. but I noticed some things:
1) A circle in a rectangle causes shortcomings. When a boss comes from up or down, the time for killing it is much less than when it comes from the sides.
2) Most of the floating bonuses are unreachable by normal magnet. The mouse is too small to collect so many. Without an option to increase mouse gathering, most bonuses are lost.
3) Prestige is not kept between runs. The compounding debuffs are way too much for just 10% bonus. Leaderboard only reached level 26.
4) The name of main weapon at Bios sometimes diverges from what you are using. e.g. You choose plasma and it shows laser. Functions normally, just the name is wrong.
5) Some blue debuffs cause much more harm than the red ones.
In order to fight the debuffs, I believe allowing continuously increasing upgrades would make it a better game.
4/5