I am a level 50 with a full set of arctic savage gear. I have upgraded the trainer at the 250k upgrade, and the health, attack, etc.
I cannot come close to defeating the last "boss" on the first cave out of the ice (the first 16 hearts cave). Am I way out of expectations thinking I can pass this level without the 500k trainer upgrade (or more)? This level is ridiculous. I have entered the last battle time and agin (I have no problem getting there) with 1/2 health+ and full shield, and I just get demolished every time. The boss often has 3-4 healing "amoebas" floating around and it is all I can do to keep them in control without generating any cascading attacks. And don't get me started on how many coins suddenly are appearing in this cave...
Overall this game has a ton of potential but has been somewhat poorly implemented. I feel that GLU is doing a good job at making a lot of average to good games, but they have a way to go. There is just no incentive to spend any money here. Why would i drop $25 to get 25000 gold, and handful of gems that wont even give me one single health, shield or attack upgrade, and a single piece of gear that is not anything amazing and has no match???
All this game has become is about grinding the first levels for gold, since later levels just don't give you much more for the amount of time spent.