Icy Tower  
I stayed away from this game for a while thinking it would be cheesy because of the main character and the generic story, but this game is truely great, despite those small shortcomings. Great control, crisp graphics and interface, and nice sounds. Well worth a download, without question.

Liquid War 5  
Great use of particle effects in this game. AI can be predictable, but this game was made for it's mulitplay. One of the few must-downloads you'll find on Allegro.cc (If you have someone to play it with)

Vigilante  
Vigilante wasn't the best of the side-scrolling beat-em-ups of it's time. With that in mind this is still a perfect conversion of an imperfect game. A lot of fun and well worth a download.