Graphics
- Very nice parallax effect
- The 'play' button has a distinctive sci-fi style
- Nice work with the main ship bitmap, I would have liked a tilted bitmap when moving left/right, though
- I also would have liked more variety with the enemy ships, at least different shades of color
- Since each enemy takes more than one shot to be killed (unless you launch a missile), some sort of differentiation (different color/differently 'dented' sprites) would have given a good visual feedback

Sound
- Nice eerie title screen track
- Good (even if a little short) game over loop
- As about the in-game music, It feels more like a 'gangsta rap' song than a space one, making the game involuntarily hilarious (unless you were going for that vibe, of course...)
- I was expecting a sound effect when launching the missile

Interface
- When I first started playing, I had a hard time telling what the numbers displayed on screen meant (displaying the missile and 'energy object' bitmap besides the digits should suffice)

Gameplay
- The game has its own playability, I liked the auto-fire and the fact that both damage and fuel revolve around the same unit of measure
- Difficulty progression seems missing, I reached 3000 points without any change of pace
- Using the keys to move the ship is not a viable option due to the inertia of the ship

Crashes/Mishaps
- The game name is 'Space Odissey' while the bitmap says 'Space Odyssey'
- When the game is over, I get 'Pontos' instead of 'Points'
- When I collect 10 missiles, the number disappears, only to reappear when I have 11 missiles

Bottom Line
- A simple but promising game, that has a lot of room for improvement.