I've always loved stretching my programming mind with game mash-ups. Most I've never completed finished/polished enough for release but I think that might change. My newest mash-up is a Frogger/tactical game called "Frozen Frogger".
Frozen Frogger is a mash-up game between frogger and tactical games like Frozen Synapse. You must plan your frogs moves to get across the road. Pick up Stars to unlock achievements and different frogs.
You will have 5-7 lives (still working on the balance) before you have to start the level over again. Game can have unlimited levels, because they are procedurally generated, but I plan on capping it around 100. Achievements will be on three tracks levels, stars, and frog deaths.
Read more for screen shots...
Plan in Action: