Not great, not special, not fun.
First - what's Techno about it? The background, maybe...
Graphics - they suffice but aren't anything particularly wonderful, so a 5.
Style - 0. There was nothing stylistic at all - apart from "techno" which was present only in the name, and the "schwoop" sound, which was irritating. Oh, and the fact that the pieces SLOW DOWN as they get to the end... did you do physics in school?
Sound - 3. Only thing soundswise is the "schwoop" of dropping a piece (which would get irritating as time went on, thank god I suck at Connect4 and lost quickly...) and the "p-dt" of getting a winner. They sufficed but weren't great - and the schwoop lost points for being irritating...
Violence - 0, obvious reasons
Interactivity - 3. Check your piece dropping code - I believe you're checking for the bottom left corner and seeing if it's above a particular column, and dropping it there. By all means use that method, just shift the goalposts so it's the middle - a much more natural judge for people who will play. Again nothing special - though seeing the hand when the CPU played was interesting.
Humour - 0. Obvious reasons - it's not meant to be funny.
Overall I gave you a four. It's your first try at this kind of thing, I'll bet, and it wasn't bad as Connect 4 goes - it just wasn't techno, wasn't special, and wasn't fun.