I have decided to play SnGs for a while and see how it goes. Last night I played two one table SnGs with 5.50$ buy in, paying three places 25-15-10. First I got into the money very short stacked and ended up in third place. In the second I was lucky and after a nice comeback from only 200 chips with 5 players left, I ended up heads up with 4500 in chips against 5500. Blinds were at 320/640.

Hand 1 (4500 vs. 5500)
I get Q30 in the SB and raise to 1500. He calls and flop brings J85 with two diamonds. I check he checks and turn brings a K. I then give up winning the hand and check it out while he bets 1500 on the river and I fold. Should I have bet or pushed the flop or turn? Bet harder preflop? Fold preflop?

Hand 2 (3000 vs. 5500)
He raises from SB to 2000 and I push with A6o
He shows AJo and also hits a J on the flop and I'm out in second place.

I could use some advice for HU play in general. Usually the blinds are at 320/640 and soon increase to 640/1280 when I go HU in these SnGs and total chips are 10 000.