Let it be said now, unless you are very good and lucky with these kinds of games, this is going to be hard. Took me about 2 hours and around 100 tries to get it.
The main thing to remember here is its a fast, pattern based game, and when you die, you fall behind in time which makes recovering and being where you need to be hard. So dying almost always means restart unless you are in a slower spot or near the end.
It may be possible to get 100k in the first level, but I maxed around 90k which is ok since the beginning of the second level is easy, and you should have plenty of lives left.
Watch this video multiple times to learn placing of where you should be (mostly left and right corner) and watch for what pickups drop from what enemies or structures.
Good luck, and hope this helps.