Clearly a good game, just look at the title
However, that being said this game does need work. The ninja is too big and it is close to impossible to dodge the aliens or first boss (That's as far as I could reach due to these downfalls). Another problem is the speed that the aliens come at you, a very good reaction time is needed to keep up with the game. A lack of instructions at the beginning left my first few attempts at the game basically trial runs - Instructions in the 'Author Comments' do not count as this is not the place for them. The runes you are actually unable to get without recieving a hit from one of the aliens which therefore pretty much makes them pointless as getting one seems to be the same as just killing yourself, another problem with the runes is you haven't included anyway of detecting how long they last. My last problem with the game is how you can hide at the bottom and not be hit. A good basis for a game but shamefully wasn't excuted well enough, I understand this is your first and because of that I say what you have done is promising. KEY ADVICE - Remember it's the detail and little things that make a game worth playing.