Well, I hadn't if you could tell me the names of a few of those games you're thinking of so I can see how similar they are that would be helpful :S
Regardless, even if it's been done before that doesn't necessarily make it conventional -however, if it's been done a lot then I suppose after a point it becomes conventional lol well, I tried to be unconventional with a platforming game but, that said, I was running out of jam time and had to scope down (shocking right xD) which is why there wasn't a lot of block variety.
Originally I was wanting to make the blocks a little more like tower defense like with them shooting the players through the levels but was having too many bugs with that so all that will have to wait til after the jam is over. Anyway thank you for your kind words!! :D