When I was a child there was a toy which was quite popular, probably some of you have seen it before.
It consisted in using two buttons to impulse a water stream inside the toy, so one could try to hook as many rings as possible and without unhooking those already hooked.
It would be very interesting and fun to find an online casino with their own version of this classic toy, it is also worth mentioning that this kind of game would be ideal for their colors and style, it would blend nicely. The problem would be to adapt the mechanics in an electronic environment and make it provably fair.
Indeed!! I can remember it perfectly, it was not too funny, but in the case you hadn't something better it made the deal

The idea about adding the risk of unhooking the ones that were previously hooked would be interesting to see at work: greediness vs. risk avoidance, it adds some exciting decision making to the typical psychomotor skills + chance mechanisms.
But if you play this game in real life, you can influence the outcome, depending your skills. If you played such game in an online casino, it would be a 100% luck based game, like dice or plinko games, or similar. I'm not saying that this game, or color game, shouldn't be implemented, though. Surely, such games will find their audience among luck based games lovers.