Glad you had fun. What key layout would you prefer? I tested this game mostly with a gamepad, the keyboard layout I used is the same I use when playing platformers in emulators and such. Thanks for the feedback.
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I would probably use shift to shift the gravity and a key on the right of the keyboard to shoot (like J, K or L). I like to use my left thumb for WASD and the jump on the space bar, and I don't want to move it to the V key, especially in sections where you need to jump and change the gravity quickly after.