To the point: use distance snapping. Example, combo 00:51:52 (1,2,3,4,5,6,7,8) - should have all the notes equal distances apart. An expection would be if you were to stack two or more notes directly on top of one another.
Also, there is an alarming amount of beats that occur off beat, like on the half beat. I strongly recommend that if you're a beginner you stick with the beat. Some notes sound better on the beat like 01:07:20 (1,2) - if you shift both notes forward half a beat.
Otherwise, this is not too bad for a first effort, hope to see you improve on it.