Speed was worthless because I was already a tank and could absorb a lot of damage, and the two money upgrades seemed useless to me also because I had already bought the most expensive thing in the game. And because of this I bought all the other upgrades that improved combat then the other two seemed almost pointless. And the game became stale. I didn't care to get past the second boss because the whole game felt like a re-run. Sadly, I've seen other games, by other developers, with the same art style, mechanics, and even enemy types. This game is lackluster at best. This is my favorite genre however in games, so I am slightly impartial, and I know it is hard to come up with your own mechanics, but add variety in your next game similar to this. (I couldn't fit it al into one comment.)
I have another complaint that is I had one good run and leveled up twice. I was only on the second upgrade of my ship, and by the end of just one shop trip it was maxed. So now all I had to spend money on was only five different, almost pathetic feeling, traits and the only one that seemed worth value was the damage just because I wanted to get through the beginning faster for a challenge.
This game also has a few nice touches to it also. Such as previously defeated bosses drop a lot of money, so having to go through all of that again isn't completely useless, but it's still is kind of annoying. It's also nice how the first boss sort of clues you in to a new enemy by dropping mines, such as how the first enemy you encounter does also. I also noticed a small glitch that doesn't effect game play or anything, but when you die and scroll over the shop button, then scroll off of it, the text on it disappears.
I love this game :O Beat it like 6 times. I played a shortened version of it on I think either Notdoppler or OneMoreLevel and loved it, so I came here to play the full thing and loved it.
I was playing ze game, and my save file was gone. I was SOOOO close to getting Legendary, too. And all I did was go on Google because my grandma wanted to know how to make Gouda Cheese. None of me other games are like this. :T