Neat splash tune

I reckon this is a neat little tune that would be a great splash screen loop of one of the games on here. The organ is reminiscent of Castlevania (and I see from your name you're into Nintendo), so maybe for something like that.

It's true that it is a little short. Perhaps it could be a main theme/level song if you drew it out to a full length like 3:00 minutes, or maybe even remixed into a hit single! ;-)
But I don't think you need to worry about Sonata form at this stage, since it is only the length of two riffs (or melodies).

hmm..

I dunno... I like what you have here. I know this is one of your first compositions and it shows. I would suggest making a bit longer and make sure the melody doesn't stray off in the middle of the song (which it did). Here's an idea: apply the sonata format. In case you don't know, this is the sonata format:

A ("exposition"): Statement of the first theme, transition into a second theme which is in a different key (if the first theme is minor, the second theme is the major key of that minor (ex. C minor to C major)), same transition melody. Repeat.
B ("development"): Anything goes. For this part, I recommend variations of the first theme. That way, it sticks out more in the listener's mind
A' ("recapitulation"): Big restatement of A, except both themes are in the same key now.

Yeah this format is very classical-y but apply it to your music and see how it works. It works for me. If you have any questions, don't be a stranger and ask. My door is always open :)