A really fun little game really. I love the old school artstyle and the game play was pretty neat. I especially like how simple the controls were.
Only two criticisms:
Background music would have really made this a wonderful experience and its a shame it didn't have any, but considering you made everything in 48 hours I feel it's understandable.
As for the 2nd, due to how little hp is lost when the boss attacks, I was more or less able to cheese the entire boss battle by standing on the top most platform and doing some simple dodges and spamming X fast enough. Some more boss variety in terms of attacks would have also been nice. (maybe having platforms disappear under you and such, it would play more into the wizard having control over the game)
Overall, a nice game! Just needs a little music and more polish.