Thanks very much! (Haha, I'm sure your first submission is much better than you remember!) I actually started on Friday (sometime in the late afternoon/early evening), so I spent more time on this than I think you think I did (the "all the time you've wasted" line was meant to include all the time I had already spent working on the game up to that point), but the sentiment and the encouragement are still very much appreciated!
And thanks for the feedback on the sound effects! Apparently I spent the whole weekend with the computer volume set lower than I realized, but after reading your comment I tried it again with the volume turned up louder, and I see what you mean: it sounds surprisingly different from (and significantly less pleasant than) what I had been hearing all weekend. (Lesson learned for next time: always play test at various volumes!)