While playing it, I thought you could have had more level area or levels for the mechanics. Like an area just using the single jump or dash to make them feel more important. Also that builds the player's skill for the more challenging areas like the homing missile. Its good to take note of what is difficult and what is easy for players. Not every aspect of the level has to be as or more difficult than the last. Its nice to reward the player with some filler easier parts. Or in two words... Level Design lol But great job for your second game!!