Super Kid Icarus controls can be changed from the options menu. Defaults are:

Arrow Keys to Move
X Key to Jump
Z Key to Attack
P Key toggles Inventory
O Key toggles Options

Super Kid Icarus is an enhanced remake of the classic Nintendo (NES) game Kid Icarus and was developed by Flip Industries. The overall gameplay remains true to the original Kid Icarus with some minor enhancements to improve the feel. The cheats remove the frustrations of Kid Icarus.

Super Kid Icarus was developed by Flip Industries as a hobby and to learn ActionScript 3.0 programming for use with the Adobe Flash/Air platform. Careful study of the original game allowed this flash update to keep the feel, tone and overall play style of the original Kid Icarus game. However, Super Kid Icarus makes use of newer technologies such as parallax scrolling, MP3 sound, 16-bit sprites and so much more.