Dev, here go some improvements:
1. Make the health and mana bars static. It's very annoying when they move with the character and then go back to it's original position.
2. A map (with fog, of course).
3. Monsters health bar.
4. A icon (or a bar, or something) to display the cooldown of the fire spell
After the changes on kill cash and cash production time, the game become slower and still have most part of my income from the packets every 15 seconds.
I also noticed that we gain exactly 9 cash per HP. Maybe increasing it with upgrade will balance between cash per kill and cash per packet.
I finished 3 stars on Jungle Brook when it wasn't connected to kong.. Neither on main screen or completing the level (without gaining 3 stars) it doesn't count to the badge... A sugestion to devs: check stars on mais screen.. A sugestion to players: Keep checking your connectivity..