GREAT game! Only 2 things I would fix.
1. Make it possible to bypass the ladder. I often find that I am looking to grab something and then the ladder makes it impossible to do so.
2. Don't allow traps to spawn on the location of the ladder. I would often go to the next level and then die because there was a trap there that I couldn't avoid.
Besides those 2 things, this game couldn't be any better. I usually prefer games with a storyline but this one didn''t need it. It was able to keep me entertained for quite awhile and I may come back and play it again. I know someone mentioned a lag but I did not notice it. So to those people who mentioned lag, it could be your system and shouldn't reflect on your overall rating of the game. :)
Great job and I hope to see even more from you in the future.