Fantastic synthesizer. Great Sound. Great usability. Perfect for beginners to start with synthesis as well as for experts who are in search of an fast to patch great sounding synthesizer. One page. Nothing confusing. Everything is there immediately.
Pros and main features:
The filters (LP+HP, LP+Drive, BP) sounding great.
The oscillators are good sounding as well and offering interesting waveshaping possibilities.
Faders for the envelopes (I love that because you can 'see' the shape of the envelopes).
The effect unit (a variety of delays like tape, diffusor, phaser type) is great too and easy to use as well.
A nice little and freely programmable seq.
The layout is perfect. One page. Nothing confusing. Everything is there immediately.
Because there are not much controls Invader 2 can be easily controlled via a MIDI controller.
Perfect for beginners because of the layout and you won't miss anything for a while (or maybe ever).
Perfect for experts too. Whether you want a synthesizer you can operate fast and blindly because it's that easy to operate or because you want every now and then a break from feature monsters... here you go.
Contra and feature requests:
I can't see any contra aspects. Really. It's pay what you want and starts at $5 (the dev suggests $25 I think) so what to demand? It sounds great, the layout is great. I don't see a competition so worth to grab any time.
CPU hit is okay. For the sound completely fine. Nothing to worry about.
I do not use presets so nothing to say about that.
Demo is available.
My main synthesizer is Zebra 2 and I love the complexity of it and that Zebra can do almost everything... and exactly here is the reason where Invader 2 kicks in: it's a break... no decisions about where, how, what ... super sound and dead easy to use. The last software synthesizer I bought was Aalto in 2013(!) because I found nothing interesting and nice enough but Invader 2 is worth the attention and worth to be owned.