jumps should be adjustable (click=small jump hold=longer jump). some way of increasing difficulty otherwise its a game about who gets less bored with time.
random generated platforms would be nice, its just the same pattern over and over.
also some kind of collectibles or upgrades or a kind of goal (challenges or something) would improve this game a lot
Damage is calculated very randomly. sometimes i do 100 points of damage (when my basic damage is over 300) then i do over 3000 damage with a crit. the outcome of boss battles is a pure thing of luck for me.
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