Really interesting concept. The mechanics might not be quite refined, but that's part of the fun, maybe. You can really cheese your way up by just jumping and moving the cube a bit up. Lost my cube at one point, because it was outside the screen and I couldn't reach it anymore. A recall button or automatically moving the blue box to the edge of the screen would really help.
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Yes a lot of the mechanics are buggy. The "cheating" part is allowed since it allows more skill to effectively use it. Most people would get faster time by following the proper level flow. And regarding losing the cube, its also part of the game. The player needs to think ahead before they jump down, to make sure their cube would be reachable. But one can always restart the level by pressing "R". Appreciate the feedback <3