Four seconds isn't a lot to review o.0
Even so, I'll try my best to pick it apart. Overall, I don't think the track is bad simply because it is only 4 seconds long. I like the feeling that it gives, that strange vibe. The percussion is decent, give movement to the song. If it was longer, I could see this being a very interesting video game loop/ambient loop. Some pointers:
While the length of a loop *technically* doesn't really matter, 4 seconds is cutting it pretty close. Most good loops I have listened to are around a minute long. This gives them time to develop, rather than be arrested indefinitely in a premature stage.
I think the clap could be filtered a bit more. The kick and the hi-hat sound more low key, and I think the high frequency nature of the clap doesn't fit in with the rest of the song. Maybe even a different clap is needed in this situation.
In the entire song, there is only one non percussion sound, which is the background hum. If you want to continue on the ambient direction, you could add more long noted instruments. Or if you wanted to pursue a more video game type track, you could add a lead or two.
I think you definitely started something awesome, but why then did you stop? So much more could have been done. Keep writing!