I've noticed a few problems as I've played this game.
1. The button to switch between fill and X on mouse control needs to be held down to switch to X instead of toggled. It's confusing to keep track of which setting it's on while switching back and forth between them.
2. Clicking an X on mouse mode while on fill should change the square to empty instead of filling it. This can prevent accidentally filling spaces the player believes shouldn't be filled.
3. All three difficulties should be unlocked from the start. Drudging through all of the easy puzzles in order to get to the challenging levels gets very boring very fast.
4. There needs to be a clearer explanation of what gold, level, and badges do. They have no clear purpose, so I have no reason to click the profile or shop buttons.
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