Sometimes the best games are the simplest...
if the graphics had been better i would have rated it higher. excellent concept and game design. i like the concept of getting new characters.
couple things to improve-
graphics- enough said
sounds- enough said
character selection- maybe make a character at the beginning that you stick with, but that you can vary as you gain more exp. for example, you could choose to put 5 pts towards shrinking the x- axis of the character by 1, or incrase his y-axis speed, etc.
keep at it!
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