The review is too brutal not to share in full over TTS here is most of it for you :)

To say that Smarties: Meltdown isn't a fraction as good as the title suggests doesn't even begin to convey how soulless, ugly and utterly starved of charm this confectionary-themed platform adventure really is. That said, we do owe the developer a big thank you.
Here's an idea: if you really love Smarties, why not blow your £20 on the real thing. That should give you about 51 packets to share with your mates, and save you the trouble of ever having to look at this again.