Minigames are a good way to avoid what you call "Developing Block Syndrome" - you are generally finished with them as soon as you get bored. Plus, you get to try out a bunch of things that you can use for later, bigger projects. So yes, go ahead and make a few minigames! You'll likely get more replies than I did, so you don't have to worry about feedback:)*

If you want your game to be a little more "unique", you might also consider throwing ideas you liked from different games together.

I did this for my first "Experimental Game", and it turned out pretty well. Generally, letting thngs react on music is still a kind-of-new concept that still feels fresh, so hurry up and use it!

A few other things I've learnt and a great thread can be found here.
Consider it the lessons of a semi-successful experiment. Plus, there are also a bunch of fun games for you to try out. And if you comment on the blog, everybody wins! Horray!

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* the concerned reader might be happy to hear that while I'm bitter, I'm still not full of hate yet.