Thanks for playing and your comments - For now will add the descriptions on the main page (would have made more of a intro if I had more time). Later, I will improve the description and provide a better feedback on your return, before releasing to mobile.
There are different types of monsters and upgrades - you should have gotten the hammer at the second stair case / boots on the second.
The difference between the p is that is 1 experience point where as the first EP is 5 experience points, next is 25 and so on
Thanks again for playing