I do find the odds for upgrading very slim. For example even with fully upgraded blacksmithing getting to a +10 is still a 0.15% chance. SO every 15/1,000,000 ones you upgrade are going to even get to level 10 without the use of the auto +7 function. Including that it's still less than a 4% chance to get to a +10 let alone a +15.
PiggyFrier Boss is where to get the 94 combo, Also the level to cash up by killing everything, but pressing restart before it registers that you've done the level ie. you don't keep getting less money for having done the level so many times.
Scratch that - I can't get any of the stars in Island Express.. They never turn up in my pause screen and always reappear every time I do the level again.
I don't feel as though I've 100% it if it isn't working...
Definitely one of the best tower defences I've played, it feels nothing like all the other generic ones, well done!
Usually I play about one level of tower defence games and then don't bother, but you've managed to put in what i want in a new tower defence, new, fun things!
Should be fixed in 1.41. Apologies.