Reply to Original tracks - Looking for some feedback

Hey folks. I started creating electronic music about a year ago. I work on my own, including the mixing and mastering stages. I'm looking for some feedback (good or bad, just make it constructive) about anything in the following original songs; mixing levels, tempo, effect choices, transitions, etc... Any input would be appreciated.

Thanks!

http://soundcloud.com/20side/betting-on-black

http://soundcloud.com/20side/keep-the-change