Max levels for research: 300% more damage, 700% more bullet speed, 50% closer objects, 75% reduced upgrades money cost, and 1,900% more research points gain, all to level 100.
Music in-game: Gray area: Counting down the hours, Green area: A Second Chance, Red area: Let's get lost together, Boss battle/Escape!: Master Vs. Apprentice, End screen: Strained Voice
@progamer2022 you can also upgrade your damage by clicking on the manual click power upgrade and you can also upgrade your auto damage by clicking on the auto-click power upgrade (the auto-click faster upgrade can also work by increasing the rate at which auto-clicks happen).