The synth at the beginning sounds a bit harsh and high-pitched at first, and then gets a little distorted when the pads come in. I think you need to Equalize out some of the lower frequencies in that first riff (and probably some of the highest ones too, as I'm not sure I'd like to hear 1.5 minutes of that rather harsh-sounding riff on repeat). I think you should really try to bring some energy to this piece. Right now, it sort of lacks meaningful progression, dynamics, and climaxes. It sounds like the first half of an intro that's somehow been drawn out for 90 seconds. Also, it doesn't loop that well, but I think you already knew that. You could definitely do a lot more with this. I want to see some more engaging content following this. I want that first riff to repeat no more than twice before you introduce the pads, and the pads' riff itself should probably only repeat no more than twice before some sort of climax/melody/transition/etc. happens. Some drums could also really help move the piece along in that regard. There are a lot of directions you could go with this, but for now it's just two rather quirky instruments whose parts happen to fit well together. I advise - no - I command you to make something of this! >:D