As pointed by another comment, its a mystery to the player which upgrade he should buy when we don't understand how velocity and damage works, there should be more numbers in stats. Also you probably know this but theres a huge ceiling to get to 25th floor even with these new upgrades, toughness is still a big ceiling. Even after farming thousands of PSI I dont see much progress either.
'huge ceiling' heheh
No, but really, I'm working on making progression a bit smoother. As for how velocity and damage work... I'll be adding more visible calculations later, but, it's fairly obvious? Each upgrade tells you exactly what it does. There's nothing secret happening other than I guess gravity, which isn't specifically mentioned, but, y'know. Kind of apparent.
 "All The Levels"){kind=icon}
 "When he jump, he go up like this"){kind=icon}
 "Rush Team Free FPS Multiplayers"){kind=icon}
 "Kongai"){kind=icon}
 "A Duck Has An Adventure"){kind=icon}
 "Cyclomaniacs Epic"){kind=icon}
 "Brick-Force"){kind=icon}
 "Wrestle Jump"){kind=icon}
 "Red Ball 4 (vol.1)"){kind=icon}
 "40xEscape"){kind=icon}
 "Knightmare Tower"){kind=icon}
 "Kingdom Rush"){kind=icon}
 "Achievement Unlocked 3"){kind=icon}
 "TDP4 Team Battle"){kind=icon}
 "UPGRADE COMPLETE!"){kind=icon}
'huge ceiling' heheh No, but really, I'm working on making progression a bit smoother. As for how velocity and damage work... I'll be adding more visible calculations later, but, it's fairly obvious? Each upgrade tells you exactly what it does. There's nothing secret happening other than I guess gravity, which isn't specifically mentioned, but, y'know. Kind of apparent.