A few thoughts.

Mix: It is important to balance the volume of instruments. To make a great sounding track, you've got to consider depth. What elements are most important and should therefore be louder to be more clearly heard? Louder sounds will come to the front of the mix. What elements play a supporting role and can hang in the background? If everything is the same volume, the track will often sound crowded. In this piece, you've got the synth so loud that it really pushes everything else. I'd turn that sucker down some. I also think the kick (bass) drum could come down at some points.

Variety and Shape: Aside from the introduction of the vocal line, the piece is pretty much a whole lot of the same material. The chords pattern you use in the guitar line just keeps doing the same thing for three minutes. Nothing new or fresh really happens. When you have so little variety, a piece of music becomes boring and grating on the ears of the listener. It comes across as bland and people will begin to tune out. This isn't to say that you need to be loud or upbeat but that variety would make this song exponentially better. This brings me to the subject of shape. Most songs have an arch to them. They ebb and flow, going from loud to soft, rising and falling in intensity. They build up to a climax maybe 2/3 of the way through and then come down in energy a bit. It's much like a story. A song needs some conflict and resolution to be interesting. The main point is that music needs to have a sense of forward motion and direction in order to take listeners on any kind of interesting journey.

You have some potential material to work with here. The guitar part sounds good and I like the chords you use. Learn about mixing and think about shape in the composition. Master those and you'll become a formidable songwriter.