This was my most successful game, I ranked in the top 10% (out of 2500 entries).
The theme was “Minimalism”, and I made a maze game in which the player had to control some magnetic particles with the mouse, bring them to the exit. When any particle hit a wall, you lost that one, and you had to reach the end with more than 50%. You could use modifiers that would change the “polarity” of your cursor, and some walls would let some particles past, and others not.
The game also featured a colorblind mode, which was pretty nice to program!
This was all programmed in C++ with the Cantrip engine, and all the art, sound and music was done in 48h by me.
You can download for free the full game and the source code.