I had heaps of fun with this one, its a superb game. Uncovering the mechanics and applying them was great. I haven't been able to complete it although I'm in the 'boss' room and I'm also not sure where to apply the Lucky 8 mechanic. My only criticism is the input sensitivity means I'm often moved two spaces off a single tap which has caused me to die or reset countless times.
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Thanks! When my girlfriend "playtested" the game and ran into the same input sensitivity issues, but unfortunately the deadline had passed by then. I'm planning to fix it in an update after the jam.
To give a small hint: you now know everything you need to know to beat the boss room. Look around in that room if you see a symbol you've only encountered once before. Where could the other symbol associated with it be?