Thank you for all the help; it's greatly appreciated. My plan is to collect all the ideas, discuss them with the team members and have a poll at the forum to select the best ones.

I wouldn't go for a huge project, with 40+ great looking levels and so on - it would take us 1-2 years to finish it and it wouldn't be the best in its category when it would be done. Apart from that, I'm open to any other idea that would help up get something out of the door in 3-9 months.

Who knows, we might end up having a great team that can produce 2 games each year; I've seen it done before.