Agreed with ViceO
I totally agree with ViceO and IKanzAnimate
1) The "Play Again" System. Please don't resurrect the players back to the start of the round with everything resetted EXCEPT the ammo. It's like originally I had 500 machinegun ammo, I spent nearly 300++ ammo on the boss and his little minions, some of them hitting the trees. (I got hit by a fireball when I was behind a tree. I think that this is totally unfair as my bullets don't penetrate through the trees, why should theirs?) I have to restart the round with only 100++ ammo of my machinegun left. It's really dumb if I were going to spend this 100++ ammo on the same amount of minions which I require 300++
2) The Healthpacks. I noticed very little healthpaks are dropping at round 4-1 to 4-3. I manage to go to round 4-3 but with like red health. Another hit and I've to restart at round 4-1 with the same amount of bullets I have before I die.
3) The Reload System. I HATE the reload system. I don't mind clicking to reload but at least put BIG block letters on top of my screen telling me to RELOAD, if not make it an auto-reload. The reload system killed at least 5 times in the game.
4) Music and Sound. Even the most shtty game in the world have some music effect almost everywhere. You game is just dull without music. Bad choice of music for the boss by the way, didn't make me feel as if I'm fighting a "Monstrously Large and Unbeatable Creature that's Gonna Kill Me In A Hit", the music just gives me the impression that a new minion with a longer health is coming after me and I can give it a few blasts from my shotgun to terminate it permenantly.
5) Terrain. It gets boring when the game becomes repetitive, blasting minions of the same terrain for at least 15mins. You get bored after 5mins. After completing round 1-X, going ahead to round 2-X, the player sees the same terrain, same environment misc. placement, he's going to think "Again!? I'm not going to fight some new minions on the same boring terrain"
6) Collision. You don't collide with the minions. Well, that makes the player think "Wow, I don't even exist" and worse of all, the moment you stand on a location with a minion in the same exact location, you get dealt a lot of damage continuously until you move away. Give players the "GOD I'M TRAPPED" feeling. It makes the game exciting.
7) Graphics. The graphics are good. Nicely animated (This may be my only compliment for this game). However, try making the "I'M HIT" effect more dramatic and obvious (noticeable), or players won't even notice that little blood splat coming out from his character, especially the ground is stained red.
8) Gameplay. It is addictive at first but soon it gets boring when all your weapons are maxed out and yet you can't complete the game because there's not enought healthpaks.
Other than these points, I can say that your game is pretty well done. The changing of weapons... well, I don't mind pressing on a key to change it but it would be faster if there were numericals.
For the gameplay I'm giving you a 7.
By the way, since you got achievements, try putting in medals.
Please note that I'm not criticising/ranting/insulting/discour aging your work, just merely giving suggestions and pointing out some factors I noticed. You can ignore them if you want but hey, it's just my point of view.