If you take away the good graphics, all this game is left with is some meagerly entertaining dialogue, a serious lack things to examine, no plot whatsoever, and a pile of completely illogical puzzle solutions.
The color of enemy projectiles does not stand out enough in my opinion. The design choice is quite poor, since everything from your own bullets to the ships to the moving background elements are colorful and stand out, while the enemy projectiles are just a dull red that slips under the visual radar. It makes it incredibly difficult to keep track of them when there are so many other things going on at once that call attention to themselves.
There is a weird bug concerning buying and selling items. I was trying to sell some of my wood, but if I sold 1, it would sell 2. If I tried to sell more than half of my wood, it would sell them all and the merchant would have double the amount I sold.