Also, Nifflas released three minigames that originally were supposed to be in his current project, but the idea was abandoned as they became incompatible with the newer engine:
BagatelleBagatelle is, as the name hints, a bagatelle-like game. Shoot balls up and try to land them in baskets for max points.
CannonIn Cannon you shoot blocks at other blocks. Try to get other blocks out of the circle. The more you manage to push out, the more points you get.
ClickDropThe point of ClickDrop is to click on rectangles to make them disappear, trying to guide the balls into baskets for points.
(post quoted mainly directly from J)