I'm always hesitant to plant bombs, due to tiny shards of glass flying halfway across the map and knocking down (killing) 3/6 of the VIPs domino-style.
Nice, but some of the newly-added training games [spoiler] Easter island running/climbing [/spoiler] Seem to be quite glitchy and have rougher animation compared to the old ones.
Actually, you can strangely max out the skill tree WITHOUT having enough points to get all 100s. The total amount is there, but due to the random skills, you'll probably end up with surplus in some categories and deficits in another. Of course, skills such as spike avoidance and cuteness don't really affect you, so you still may be able to max out your potential.
One issue: When in slow motion, the anti-freezer's "bullets" still disappear after the same amount of time as without slow motion, limiting it's range and damage even more.
The white portal is easy. Use a big kaiser lvl 6 and just run around maintaining ~4+ active blades at each side at all times. They die after shooting 1-2 shots.