At level 23 zombies stopped coming making it impossible to complete the level. The achievements system is buggy, completed ones were forgotten after completing some level.
Viktor XII discovered the promised land but as he let his child behind, Viktor XIII spent his life wandering in the cold just to be killed by some spikes. However, as tradition dictates, Viktor XIII also left his own child behind before leaving so that Viktor XIV could succeed after a 15 years long trip. Probably to late to meet his grandfather but at least only great warriors are allowed in the Green Land.
Level 75 is almost impossible. What worked for me was to capture the top lab, use it to capture the two top-right towers, each one having 100 jellies. By the time I reached this state the opponent had captured all my other buildings (I captured all the neutral buildings to keep him busy). I was then able to capture the boss because he had less than 20 jellies just having sent a lot of them to the others buildings. Otherwise you'll also need to be very lucky!
Ok, I got laggy controls using firefox 3.6.10 on an old Pentium M 1,6Ghz used. The game uses 100%, that's a lot even for my old computer considering what kind of graphics are involved...
Really like the idea of the game but there are some issues with the gameplay.
1) Speed increase steps shall be smaller : it's really hard to control the character !
2) Skiing : I thought I would accelerate when facing the slope and slow down when turning.