Mermaid using dash mechanics for movement :) For example; if you want move to right side you must press "Space" key while you pressing "D" key.
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Well, I feel quite silly for not realizing that! I thought WASD was going to be just normal movement by itself, and then the space key would be an extra speed boost on top of that. Thanks for correcting me! I was able to play through some levels and I can give the game a better score now - the levels can be quite challenging!