I can say it was a wild ride going through each level, especially after collecting 50 stars where levels became more challenging. I loved the physics behind them, even the physics of the alien where its wobbly body structure forces the player to stay focused on surrounding dangers. In some levels you had control where the alien went in order to avoid touching the traps. Each level design is well studied and well-made and combines with the progressing difficulty. Difficulty is another element I liked a lot because it was balanced and never unfair, even if there was a level I truly hated and made me almost rage: level 21.
The fact I had to carefully move each box to left corner of the level to make sure the red button is pressed while, at the same time, I had to constantly check the laser and avoid the saw, made this level true hell. This was particularly true during first tries where I had to test different strategies before finally finding the right one. I hated it but I also loved when I finally beat it, because remaining levels were a lot easier to deal with.
I liked the balanced nature of the difficulty and the easy learning curve for each level. The combination of hand coordination and mental strategy makes this game one of my favoruite of this category so far. The stars are thankfully easy to get even if in later levels it becomes more tricky due to the combination of more traps (razors, lasers, buttons, electric barriers), nothing too impossible at the end of the day though. Besides the gameplay I also found adorable the alien design. He's so cute with that big eye and round shape. Music is nice too.
Overall a fun, challenging but not ragequitting inducing game. Nice job, keep it up :)