heres some tips
(1) at least have a dying animation before suddenly flashing the death screen.
(2) have some type of tutorial before the game starts. since it looks so similar to a mario clone i instantly went for jumping on the enemies and died.
(3) why 100 coins per coin? that's way too many, this is not a casino.
(4) PLEASE choose a better font for the levels.
(5) dont copy and paste the same graphic for the ground everywhere.
(6) WASD should work and using the up arrow should also make you jump. I may be sounding a bit picky, but most games let you use both WASD or arrow keys.
(7) some blocks are not placed correctly in the "grid".
(8) the moving platform is too quick and just the first level is too hard. Since you only get one life, this game is incredibly difficult for no reason.
(9) no menu
This is probably a mistake on the logo part. They don't receive any benefit from players (since there is no in game transactions) so the thumbnail and title were probably mistakes. The actual game runs smoothy though, unlike most games made on scratch. This became one of the lowest star rated games on kongergate due to this.
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no i won't