It is a good game but I maxed the 3rd boxer by purely training, i got 27 weeks left for fights. As you wrote, giving it more end game rythm... try to focus on using skills, skill recharge, longer figths. This statistic says that almost 4/5 of the game is about clicking TRAIN button.
Good game, possibilty of moving/selling/canceling turret selection would be nice. It's a bit annoying when turrets hasten bunnies that come past them towards the goal. And yes, we like upgrades and achievements :D
"What a brilliant game" were my first thoughts, oh it has multiplayer BRAVO, and than came guy with exploding shotgun a converted this beautiful DM,TDM game into sh*t. Delete overpowered weapons, its annoying that if you want to play you have to use just this exact weapon because its... just aim in approximate direction and fire, the frags will come without any effort. This game has lot of potential just need a little balancing. thumbs up for creator to read
don't know if it has an ending but its almost copy of much older game called GROW http://www.eyezmaze.com/eyezblog_en/blog/2006/12/grow_ver1.html#monster