Nice and smooth 5/5 BUT: Everything should be keyboard controlled (what the use of using a shortcut to open a window if we need the mouse to close it? - a lot of games are like that... don't understand. )
TIPS:
UPGRADES : go for the strengths, then later on health - like this I got nearly all the 'free me scores' at lvl18 (+ I'm not specially good + I'm not going to reset them to see what others are like now. )
BOSS : use jam. For 1st Boss, if your not very good like me, just stay underneath and don't move - you'll get less damage.
Nice - though gravity seems unreal, everything weighs the same.
NOTICE: for those who start - positions are very approx: I had a box 45° on a 90° square. Seems if you touch the 4 sides it's OK
 "Skate Dog"){kind=icon}
 "Blueberry: Escape From Chaos Factory"){kind=icon}
 "RELAX"){kind=icon}
 "Superstar Combo"){kind=icon}
 "Only your game!"){kind=icon}
 "Globule"){kind=icon}
 "The Life Ark"){kind=icon}
 "Puzzlecore"){kind=icon}
 "Assembler 2"){kind=icon}
 "Sheepy"){kind=icon}
 "Sketch"){kind=icon}
 "Raider: Episode 1"){kind=icon}
 "Closure"){kind=icon}
 "Gravibounce"){kind=icon}
 "Sonic on Clouds"){kind=icon}
 "Optical Illusions"){kind=icon}
 "Mousewheel Speedtest 08"){kind=icon}
 "DOMINO-P"){kind=icon}
 "Switch"){kind=icon}